Save status in the ds1307 RAM

1 files changed, 18 insertions, 9 deletions

diff --git a/ds1307/arduino_sketch/fuzzy_alarm_clock_ds1307.pde b/ds1307/arduino_sketch/fuzzy_alarm_clock_ds1307.pde
index 224706a..54c6993 100644
--- a/ds1307/arduino_sketch/fuzzy_alarm_clock_ds1307.pde
+++ b/ds1307/arduino_sketch/fuzzy_alarm_clock_ds1307.pde
@@ -35,15 +35,9 @@ void setup () {
     digitalWrite(YPIN,255);
     digitalWrite(BPIN,0);
    
-    // DEBUG: we want to read the setup messages
-    
-    delay(5000);
-    digitalWrite(YPIN,0);
-
     // if the RTC is already running read alarms and status, 
-    // otherwise set everything to the default
+    // otherwise set everything to a sane default
     if ( RTC.readData(0x00) >> 7 ) {
-        Serial.println("Setup the clock");
         for ( int i = 0 ; i < NALARMS ; i ++ ) {
             for ( int j = 0; j < 5 ; j ++ ) {
                 alarms[i][j] = 0;
@@ -51,12 +45,17 @@ void setup () {
         }
         st = 0;
         a = -1;
+        save_status();
     } else {
         st = RTC.readData(0x08);
         a = RTC.readData(0x09);
         cmin = RTC.readData(0x0a);
-        // FIXME: we want to update st to the time passed 
-        // since the data was saved
+        // This only works if the arduino had no power for a 
+        // "short" time. This is by design. :D
+        RTC.readClock();
+        st = st + (RTC.getMinutes() - cmin) % 60;
+        cmin = RTC.getMinutes();
+        save_status();
         for ( int i = 0; i < NALARMS ; i ++ ) {
             for ( int j = 0; j < 5 ; j ++ ) {
                 alarms[i][j] = RTC.readData(0x0b + i*5 + j);
@@ -95,6 +94,12 @@ void loop () {
   
 }
 
+void save_status() {
+    RTC.writeData(0x08,st);
+    RTC.writeData(0x09,a);
+    RTC.writeData(0x0a,cmin);
+}
+
 // ****** Serial interface management *************************************** //
 
 void check_serial() {
@@ -135,6 +140,7 @@ void s_set_alarm() {
 }
 
 void s_set_time() {
+    RTC.start();
     RTC.setYear(s_read_2dig());
     RTC.setMonth(s_read_2dig());
     RTC.setDate(s_read_2dig());
@@ -271,6 +277,7 @@ void check_time() {
                     a = i;
                     st = 1;
                     cmin = mm;
+                    save_status();
                     if ( ( alarms[i][0] & 128 ) == 0 ) {
                         // this alarm won't be repeated
                         alarms[i] = { 0,0,0,0,0 };
@@ -286,6 +293,7 @@ void check_time() {
         if ( cmin != mm ) {
             cmin = mm;
             st++;
+            save_status();
         } 
     }
 
@@ -311,6 +319,7 @@ void set_leds() {
       // reset stuff
       st = 0;
       a = -1;
+      save_status();
       analogWrite(RPIN,255);
       analogWrite(YPIN,0);
       analogWrite(BPIN,0);